From patchwork Mon Feb 1 14:51:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Ardelean X-Patchwork-Id: 12059225 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22A26C433DB for ; Mon, 1 Feb 2021 15:17:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D13F464E97 for ; Mon, 1 Feb 2021 15:17:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231206AbhBAO5D (ORCPT ); Mon, 1 Feb 2021 09:57:03 -0500 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:57218 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231253AbhBAOuQ (ORCPT ); Mon, 1 Feb 2021 09:50:16 -0500 Received: from pps.filterd (m0167089.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 111El77M014271; Mon, 1 Feb 2021 09:48:48 -0500 Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0a-00128a01.pphosted.com with ESMTP id 36dbucuqb1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 01 Feb 2021 09:48:47 -0500 Received: from SCSQMBX10.ad.analog.com (SCSQMBX10.ad.analog.com [10.77.17.5]) by nwd2mta4.analog.com (8.14.7/8.14.7) with ESMTP id 111EmjQp060987 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 1 Feb 2021 09:48:46 -0500 Received: from SCSQMBX11.ad.analog.com (10.77.17.10) by SCSQMBX10.ad.analog.com (10.77.17.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.721.2; Mon, 1 Feb 2021 06:48:44 -0800 Received: from zeus.spd.analog.com (10.66.68.11) by SCSQMBX11.ad.analog.com (10.77.17.10) with Microsoft SMTP Server id 15.1.1779.2 via Frontend Transport; Mon, 1 Feb 2021 06:48:44 -0800 Received: from localhost.localdomain ([10.48.65.12]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 111EmNuG027350; Mon, 1 Feb 2021 09:48:41 -0500 From: Alexandru Ardelean To: , CC: , , , , , , , Alexandru Ardelean Subject: [PATCH v3 10/11] iio: buffer: introduce support for attaching more IIO buffers Date: Mon, 1 Feb 2021 16:51:04 +0200 Message-ID: <20210201145105.20459-11-alexandru.ardelean@analog.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210201145105.20459-1-alexandru.ardelean@analog.com> References: <20210201145105.20459-1-alexandru.ardelean@analog.com> MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.737 definitions=2021-02-01_06:2021-01-29,2021-02-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 clxscore=1015 suspectscore=0 malwarescore=0 mlxscore=0 priorityscore=1501 bulkscore=0 mlxlogscore=999 spamscore=0 phishscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2102010079 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org With this change, calling iio_device_attach_buffer() will actually attach more buffers. Right now this doesn't do any validation of whether a buffer is attached twice; maybe that can be added later (if needed). Attaching a buffer more than once should yield noticeably bad results. The first buffer is the legacy buffer, so a reference is kept to it. At this point, accessing the data for the extra buffers (that are added after the first one) isn't possible yet. The iio_device_attach_buffer() is also changed to return an error code, which for now is -ENOMEM if the array could not be realloc-ed for more buffers. Signed-off-by: Alexandru Ardelean --- drivers/iio/industrialio-buffer.c | 80 +++++++++++++++++++++++++------ include/linux/iio/buffer.h | 4 +- include/linux/iio/buffer_impl.h | 3 ++ include/linux/iio/iio-opaque.h | 4 ++ 4 files changed, 74 insertions(+), 17 deletions(-) diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c index 692f721588e2..a69bb705d173 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -1445,11 +1445,21 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer, return ret; } +static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer) +{ + bitmap_free(buffer->scan_mask); + kfree(buffer->buffer_group.name); + kfree(buffer->buffer_group.attrs); + iio_free_chan_devattr_list(&buffer->buffer_attr_list); +} + int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev) { + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); struct iio_buffer *buffer = indio_dev->buffer; const struct iio_chan_spec *channels; - int i; + int unwind_idx; + int ret, i; channels = indio_dev->channels; if (channels) { @@ -1463,27 +1473,45 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev) if (!buffer) return 0; - return __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev, 0); -} + for (i = 0; i < iio_dev_opaque->attached_buffers_cnt; i++) { + buffer = iio_dev_opaque->attached_buffers[i]; + ret = __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev, i); + if (ret) { + unwind_idx = i; + goto error_unwind_sysfs_and_mask; + } + } -static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer) -{ - bitmap_free(buffer->scan_mask); - kfree(buffer->buffer_group.name); - kfree(buffer->buffer_group.attrs); - iio_free_chan_devattr_list(&buffer->buffer_attr_list); + return 0; + +error_unwind_sysfs_and_mask: + for (; unwind_idx >= 0; unwind_idx--) { + buffer = iio_dev_opaque->attached_buffers[unwind_idx]; + __iio_buffer_free_sysfs_and_mask(buffer); + } + kfree(iio_dev_opaque->attached_buffers); + iio_dev_opaque->attached_buffers = NULL; + return ret; } void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev) { + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); struct iio_buffer *buffer = indio_dev->buffer; + int i; if (!buffer) return; iio_buffer_unregister_legacy_sysfs_groups(indio_dev); - __iio_buffer_free_sysfs_and_mask(buffer); + for (i = iio_dev_opaque->attached_buffers_cnt - 1; i >= 0; i--) { + buffer = iio_dev_opaque->attached_buffers[i]; + __iio_buffer_free_sysfs_and_mask(buffer); + } + + kfree(iio_dev_opaque->attached_buffers); + iio_dev_opaque->attached_buffers = NULL; } /** @@ -1601,13 +1629,35 @@ EXPORT_SYMBOL_GPL(iio_buffer_put); * @indio_dev: The device the buffer should be attached to * @buffer: The buffer to attach to the device * + * Return 0 if successful, negative if error. + * * This function attaches a buffer to a IIO device. The buffer stays attached to - * the device until the device is freed. The function should only be called at - * most once per device. + * the device until the device is freed. For legacy reasons, the first attached + * buffer will also be assigned to 'indio_dev->buffer'. */ -void iio_device_attach_buffer(struct iio_dev *indio_dev, - struct iio_buffer *buffer) +int iio_device_attach_buffer(struct iio_dev *indio_dev, + struct iio_buffer *buffer) { - indio_dev->buffer = iio_buffer_get(buffer); + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + struct iio_buffer **new, **old = iio_dev_opaque->attached_buffers; + unsigned int cnt = iio_dev_opaque->attached_buffers_cnt; + + cnt++; + + new = krealloc(old, sizeof(*new) * cnt, GFP_KERNEL); + if (!new) + return -ENOMEM; + iio_dev_opaque->attached_buffers = new; + + buffer = iio_buffer_get(buffer); + + /* first buffer is legacy; attach it to the IIO device directly */ + if (!indio_dev->buffer) + indio_dev->buffer = buffer; + + iio_dev_opaque->attached_buffers[cnt - 1] = buffer; + iio_dev_opaque->attached_buffers_cnt = cnt; + + return 0; } EXPORT_SYMBOL_GPL(iio_device_attach_buffer); diff --git a/include/linux/iio/buffer.h b/include/linux/iio/buffer.h index 8febc23f5f26..b6928ac5c63d 100644 --- a/include/linux/iio/buffer.h +++ b/include/linux/iio/buffer.h @@ -41,7 +41,7 @@ static inline int iio_push_to_buffers_with_timestamp(struct iio_dev *indio_dev, bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev, const unsigned long *mask); -void iio_device_attach_buffer(struct iio_dev *indio_dev, - struct iio_buffer *buffer); +int iio_device_attach_buffer(struct iio_dev *indio_dev, + struct iio_buffer *buffer); #endif /* _IIO_BUFFER_GENERIC_H_ */ diff --git a/include/linux/iio/buffer_impl.h b/include/linux/iio/buffer_impl.h index 41044320e581..768b90c64412 100644 --- a/include/linux/iio/buffer_impl.h +++ b/include/linux/iio/buffer_impl.h @@ -112,6 +112,9 @@ struct iio_buffer { /* @demux_bounce: Buffer for doing gather from incoming scan. */ void *demux_bounce; + /* @attached_entry: Entry in the devices list of buffers attached by the driver. */ + struct list_head attached_entry; + /* @buffer_list: Entry in the devices list of current buffers. */ struct list_head buffer_list; diff --git a/include/linux/iio/iio-opaque.h b/include/linux/iio/iio-opaque.h index 3e4c3cd248fd..c909835b6247 100644 --- a/include/linux/iio/iio-opaque.h +++ b/include/linux/iio/iio-opaque.h @@ -7,6 +7,8 @@ * struct iio_dev_opaque - industrial I/O device opaque information * @indio_dev: public industrial I/O device information * @event_interface: event chrdevs associated with interrupt lines + * @attached_buffers: array of buffers statically attached by the driver + * @attached_buffers_cnt: number of buffers in the array of statically attached buffers * @buffer_list: list of all buffers currently attached * @channel_attr_list: keep track of automatically created channel * attributes @@ -24,6 +26,8 @@ struct iio_dev_opaque { struct iio_dev indio_dev; struct iio_event_interface *event_interface; + struct iio_buffer **attached_buffers; + unsigned int attached_buffers_cnt; struct list_head buffer_list; struct list_head channel_attr_list; struct attribute_group chan_attr_group;